According to the Scientific American, Minnesota State has just decided to create a carbon fee of between $4 and $34 per ton of carbon dioxide emissions to the cost of coal-fired electricity.

This will directly concern the electricity 'imported' from North Dakota, who consequently decided to sue Minnesota. As explained in Treehugger website, this doesn’t constitute a carbon tax at the border per se, but sparks the debate on border tax adjustment related to carbon after the low outcome in Copenhagen.

In the meantime, a few days before the European Council of Environment Ministers, speculations are high on the possibility of introducing a carbon tariff at the border of the EU. Although the French president Nicolas Sarkozy is still struggling to pass his national carbon tax, he still strongly supports the creation of a European carbon tariff.  

Euractiv.com outlines the different points of view at stake in the EU discussion.

As the EU is seeking to extend and bolster its ETS despite the result in Copenhagen, it will have to find its way between preparing the next UNFCC Mexico summit by postponing any announcement on carbon tariffs and protecting unilaterally its economy by designing a carbon tax.